Internal-combustion rock-drill.



L. L. SCOTT."

INTERNAL GOMBUSTION ROCK DRILL.

APPLICATION FILED DEG. 27.1907.

Patented Aug. 24, 1909.

2 SHEETS-SHEET 1.

I N VEN TOR.

L. L.- SCOTT. INTERNAL GOMBUSTION ROCK DRILL.

APPLIOATION FILED DEO.27,1907.

Patented Aug. 24, 1909.

2 SHETS-SHBBT 2.

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INVENTOR. X. @fr

UNITED sfrn'rns rarnnr cranica.

LEWIS L. SCOTT, 0F IOPLIN, MISSOURI.

INTERNAL-COMBUSTION ROCK-DRILL.

- To all ui/toml it 'may concern.'

Be it known that I, Lnwis Il. Scorr, a citizen of the United States, residing at Jop lin, in the county ol' Iasper and State of Missouri, have invented certain new and useful Improvements in Internal-Combustion Rock-Drills, ol which the following is a specification.

This invention relates to improvements in internal combustion, or gas actuated rock drilling machines or engines, intended for use in mining work, for the drilling of holes to receive explosive charges for dis lacing or breaking away the rock or minera The objects of this invention are: to pro duce a gas actuated'rock drill which shall be of comparatively small dimensions and of compact, simple, and inexpensiveeonstruction, and of such. a nature that it will stand the jarring racketit is required to stand.

One feature of a machine or engine constructed in accordance with my invention, lies inthe fact that all vital parts are coinpletely inclosed, and are thereby protected from damage consequent upon the rough handling such machines usually rece/lle at the hands oftheir operators; further, the machine or engine is easily manipulated or controlled and being of comparatively.light construction may be easily transportedhas may be required.

A further object is to provide a new and novel mechanism l'or rotating the rock cutn ting drill bit', also to provide a cushion for relieving the jar from the main body of the drill, when the drill bit strikes the rock also to provide Va drill that will receive an impulse on every up as well as every down stroke, and so .arranged that the drill rod and chuck will always remain cool g as well as to improve the drill in many other respects; and to these ends my invention consists in various features of construction and arrangement of parts, having the general inode of operation and accomplishing the resullsas hereinafter described, illustrated in the accompanying drawings, and particularly pointed out in the appended claim.

Referring to the accompanying d rawings,.

Which form a Jartof this specitication, Fig- -ure 1 is a horizontal plan, shown partly m section of my improved internal combustion rock drill. Fig. 2 is a vertical longitudinal section of same; Figj is a cross section on the line A" A ol' Fig Fig. 4 is an en- Specification of Letters Patent.

Y Application filled December 27, 1907.

Patented Aug, ai, ieee,

Serial No. 408,301.

larged view of the rotating mechanism; Fig. 5 is an end view of saine with plate 26 removed, Figli is a section of rock showing common fcrmationol' same. Fig. 7 is a sectional vien" oi' piston, connecting rod and crank shaft.

Like parts are represented by similar numerals of reference 1n the several views.

The numeral 1 denotes what I term as the iirst cylinder, which may be of any suitable or preferred desi n. The explosion chamber 46, of the cy inder 1, is closed by the head 12, and the chamber 2 (which receives the mixture of gas and air that is to be e2;- ploded in the chamber 46), is elosed'by the crank caso 3; the said crank case carries the main journals 44 of the crank shaft; the crank arms 11 serve as balance wheels and also join the main shafts 44 through the pin 45. The long ways 39 form a part of the casting 1, and serve as slides, (which can be mounted on a tripod commonly used on rock drills), and also forms a guide for the 2nd cylinder 13, which is secured to the ways 39 by the cap screws 41; the 2nd cylinder 13 is also secured to the first cylinder 1, through the head 12, (which is common to both cylinders) by the cap screws 47.

It will be plainly seen that by this arrangement the two cylinders will always remain rigid with each other. The piston 1.0 has passages 7, connecting, (at certain times),`

the chambers 2 and 46. Piston 33 .has a siniilarp '1S which connects at certain times the chambers 15 and 20, the purposes of which will be more fully described. The piston 10, which reciprocates in the cylinder 1, is connected to the crank pin 45 by the connecting rod 5. The piston rod 16 connects the pistons 10 and and is made hollow (with the exception of the center wall 48). The piston rod 16 is packed with the common segment piston snap rings 3-4, for the purpose of preventing any of thel eXplosive charge to pass from the chamber 46 to 15 or vice versa. The head 12, not only serves the purpose of closing the explosion chamber 46 and 15, also securing the cylinders 1 and 13. with each other, but acts as a cylinder or guide, in which the'piston rod 16 reci' rocates.

'l 1e cylinders 1 and 13, and connected parts, are adjustable by the screw 37, or some other equivalent or convenient device,

in connection with whlich the usual tripod and shell support may ,be utilized.

` 24, and it vents the said cylinder 25' from The explosion chamber 15 of the cylinder 13 is closedby the head 12; and the chamber 2O (which-receives the charge of gas and air that is to be'ex loded in the Chamber 1,5 of the cylinder 13l is closed by the head 2.1, said head 21 also serves as a stuffing box to prevent any esca ing of as around the recipr'oeating drill ro 23.

T e cylinder 13 is enlarged at its outer end to make room for a circular plate 26 and the pawl 24, the purposes of which will be described later. The disk 31 (which is fixed to drill rod 23) fits very loosely in recessed portion of iston 33, and is cushioned on either side by t e springs 42 and 54. Spring 42 is made very heavy so as to stand a owerful blow and relieve the intense shock om main parts of drill, when the drill bit strikes the rock.v

The small spring 54 forms a cushion between the disks 31 and the plate 32, and prevents the knocking on said plate 32, caused by the spring 42` giving when the drill bit strikes rock, also by the inertia of drill rod, chuck, etc., on up stroke of drill. On the 'end of the piston 33 is screwed the late 32,

which is bored out to receive the dri l rod 23, the steel disk 31, which is of larger diameter than the drill rodA 23, is screwed on to the end :of the drill rod 23 and bears against the spring 42 on one side, and against spring 54 on the other. It will be plainly seen that the drill rod 23 must reciprocate with the piston 33, but that it is free to rotate independent of the said piston 33. Fitting loosely around the drill rod 23 is a small elon ated cylinder 25; at the end of said small ey inder 25 that bears against the head 21, the diameter of said small cylinder, is enlarged, andfon the circumference of this enlarged diameter common ratchet teeth are out. Along the surface of this elongated cylinder 25 the spiral grooves 28 are cut; after these grooves (or series of rooves if necessary) are out, the cylinder band 29 is shrunk on to the elongated cylinder 25 for the-purpose of adding strength toit.

Secured to the drill rod 23 are the steel pins 27, which fit and work in the spiral rooves 28. The pawls 24 are pivoted in the lgiead 21 and the plate 26, and work inthe ratchetend of the cylinder' 25. The plate'26 serves the urpose of supporting the pawls lliearsl againstt 1e slde of the enlarged diameter of the cylinder 25 and premovlng up with the drill rod 23; it will be plainly seen that as the drill rod moves down the cylinder 25 will be rotated artly around, on account of the ins 27 wor ing in the spiral grooves 28; an as the drill rod moves up the cylinder 25 is held firm on account of the pawls 24 working in the ratchet of the cylinder 25, and the drill rod is forced to lrevolve. It will also beseen that by having the long extension in the ratchet casting a very short stuffstufling box and by disk 31 (which is fixed to ldrill rod 23) fitting very loosely in recessed piston 33, the drill rod can give a small amount in any side direction without cramping or breaking piston ordrill rod.

Any suitable sparkingv mechanism comA monly used on gasolene engines may be utilized to explode the charge of gas and air after it has been introduced into the explosive chambers. I'do stricted to any particular kind.

The operation of my rock drilling engine is as follows: Assuming that a charge of gas and air has been drawn into the chamber 2 (through the inlet port 4) as the pistons 10 4and 33, move' backward a vacuum is formed in chamber 20 and when the port 4 is un-` covered by `piston 33, a charge rushes into chamber 20, lwhile at the same time the charge in chamber 2 is being compressed; when the piston 10 reaches the end of its stroke, the port 8 of the cylinder head 12 is in linelwith the passage 7 and the oompressed charge inthe chamber 2 rushesv through the passages 7'into the chamber 46 as the pistons move forward the charges in the chambers 46 and 2G are being compressed while at the same time a new charge 1s being sucked into the chamber 2 in a similar manner as described for chamber 20;'as the pistons 10 and 33 reach the end of their forward strokes, 'the charge in chamber 46 is exploded by means of a spark commonly used on gas'olene engines, and the ort 17 ofthe cylinder head 12 is in line wit the passage 18 'and the charge in chamber 20 rushes through the passage -18 to the chamber 15; .as the istons move backward, caused by the expfbsion in the chamber 46, the charges in the chambers 2 and 15 are being oompressed, while at the same time a new charge 1s drawn into the chamber 20 as before described; as the pistons reach the end of the backward stroke the exhaust gases from chamber 46 pass throu h the port 9, and a new charge from chamber 2 passes into the chamber 46, as before described; at the end of this backward stroke the charge in the chamber 115 is exploded by the spark commonly used on gasolene' en ines 'and the operations as before describe are repeated. It will be plainly seen that an explosion will take place in the chamber 46 on every up stroke, while there will be a similar explosion in th'e chamber 15 on every down stroke.

pistons reeiproeate,'the drill rod will be autonot wish to be rematically rotated as before despribed. That the drill rod is on a swivel bearing. Also that the rotating mechanism and drill rod are not exposed to heat, but are kept cool by the charge passing over them. Also that as the drilling tool 52 (which is common to rock drills and is iixed to the drill rod by any form of chuck, such as 3'0) strikes the rock, the blow will come directly on the cushion 42, and the shock will be relieved from the main parts of the engine. All parts are air and water tight, no arts exposed..

Having thus iliilly described my invention, what I claim as new and desire to secure by Letters Patent is ln a drill, the combination with a cylinder provided at each end with a head, of a plate disposed Within the cylinder adjacent to and parallel with one of said heads; a reciprocatory piston slidable Within the cylinder; a drill rod connected to the piston and movable therewith, said drill rod extending through alining openings formed axially ol said dplate and the adjacent head; a sleeve fitte loosely upon the drill rod and provided with a slot, said sleeve terminating at its outei1 end in an annular enlargement located in the chamber formed between said plate and head and provided with a circumscribing series of ratchet teeth; a pin carried by said drill rod and extending into said slot a pin located in said chamber and having its ends seatc= in alining openings formed in said plate and head; and a pawl carried by said pin and arranged for engagement with said ratchet teeth, whereby said sleeve Will be rotated upon. said drill rod at each movement of the latter in one direction, and Will be held against rotation at each movement vin the opposite direction, to eilect the rota.-

tion of said drill rod.

LEWS L. SCGTT.

Witnesses:

J. H. YOUNG, W. W. ViLLrAMs. 

